APU is just another name for a GPU, not for CPU+GPU that would be Fusion. AMD wants to stress the difference of an APU Chip which can "accelerated" everything to a normal Graphics Core which just draws nice pictures.
cheers
Bingle

The First AMD Fusion Products to Be Available Only in 2011
[11/15/2008 02:15 PM]Advanced Micro Devices, the world's second largest supplier of x86 central processing units (CPUs), will delay introduction of chips that feature both general purpose as well as graphics processing cores to 2011.
Instead of releasing its chips thayt combine both x86 general-purpose processing cores with graphics processing cores in 2009 or 2010, AMD decided to release them in 2011, five years after acquisition of ATI Technologies, the company said at a meeting with financial analysts in New York.
The first accelerated processing units (APUs) - the term AMD uses to describe its CPU-GPU chips - will be code-named Llano and Ontario. The former - Lllano - will feature four cores, 4MB of cache, graphics processing engine and DDR3 memory controller; the latter - Ontario - will sport two cores, 1MB of cache and DDR3 memory controller. The Llano will be targeted at mainstream desktop market segment, whereas the latter will be aimed at ultra-portable notebooks.
AMD decided not to disclose any peculiarities of the new CPUs' micro-architecture.
Tags: AMD, Fusion, Ontario, Llano
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